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Old 03-06-2007, 10:17 PM   #1
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Has anyone ever found a solution to this furnace problem?

I put metal screen behind in inlet/outlet for the furnace. Without it, I'm guarranteed to get wasps and mice in those holes with regularity. Well a buddy of mine found out why the screen isn't recommended. Turns out he was staying in his trailer when it was quite cold outside and his CO detected went off. It was because the screen actually iced up on him and he wasn't getting good airflow through the outside vents.

Has anyone come up with a good solution to this problem? I was thinking about making a large screen enclosure outside the vent holes leaving enough room so hopefully a freeze up won't occur.
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Old 03-07-2007, 12:25 AM   #2
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I've never had the problem, I don't use a screen. If a screen is a must, make it removable so it isn't going to affect the heater operation when you are camping.
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Old 03-07-2007, 05:33 AM   #3
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The person who had a CO problem should get his furnace serviced. The combustion chamber should not leak into the inside of the trailer regardless of the airflow. A blockage of the airflow could cause the flame to go out, but never cause the CO level to rise inside the trailer.
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Old 03-07-2007, 05:51 AM   #4
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If the screws holding the flange become loose you WILL get CO into the coach. I had this happen to me. Turns out 3 of the screws were missing and the lone screw was loose. Replacing the screws solved the problem. I used a professional CO detector from work, similar to what the fire department has.
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Old 03-07-2007, 07:55 AM   #5
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Good morning ... Our screen is on the outside of the trailer.. never any problem...
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Old 03-07-2007, 08:01 AM   #6
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What do you mean by "on the outside of the trailer"? Behind the plate/flange or in front of it somehow?
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Old 03-07-2007, 09:00 AM   #7
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I got one of these: RV Parts, RV Maintenance, Trailer Maintenance - Camping World The pictures aren't very big and I don't quite see the one I needed. Open the furnace access door and place it into the exhaust hole in the door. Mine is the dome type -- a lot of surface area. I've spent weekends out in freezing weather and not see condensation freeze-up.
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Old 03-07-2007, 09:37 AM   #8
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I use the KISS principal for the same problem on heater and water heater. Cut a piece of screen and attach with small magnets (my grills are steel). I remove when traveling and attach when I return.

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Old 03-07-2007, 11:53 AM   #9
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Quote:
Originally Posted by ptrvr
I use the KISS principal for the same problem on heater and water heater. Cut a piece of screen and attach with small magnets (my grills are steel). I remove when traveling and attach when I return.
Greg
Greg- Sounds like a good idea! I would even go as far as placing some of the big red "REMOVE BEFORE FLIGHT" streamers on them so you never forget to remove them. Check your manuals folks. Never modify the air inlet or flue of your furnace or HW heater. Serious injury or death could occure. I personally don't need any more warning than that!
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Old 03-07-2007, 01:04 PM   #10
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Bob, that is exactly what it is.. have put one on each of our trailers.. Marvin believes in preventive maintainace...sp.. lol.. Keeps the mud dobbers out.. and anything else that might like to make it a home...It fits on the outside..
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